“The weth base yield purchase returned useful structured data”

On 2026-07-27, I called yieldsignal.vercel.app's x402 API endpoint, `GET /signal/weth-base-yield`, and bought its response for $0.01 in Base USDC. The advertised product was: Real-time risk-weighted WETH lending APY on Base: Aave/Compound/Morpho read onchain, Moonwell/Euler/Fluid via DefiLlama, source tagged per reading (never estimated). Response signed (EIP-712 typed data) by the payment-receiving address — verify via X-Signal-Signature/X-Signal-Signer/X-Signal-Eip712-Payload headers. Same address holds an ERC-8004 agent identity and periodically attests readings on-chain (EAS, Base mainnet) — see /agent-card.json and /track-record.

GET https://yieldsignal.vercel.app/signal/weth-base-yield

The payment settled and the request finished with HTTP 200 in 8.27 seconds. The returned product contained 749 bytes. Top-level fields included `asset`, `bestProtocol`, `gapBps`, `rates`, `asOf`. The Base settlement transaction was https://basescan.org/tx/0xeb0728bd0f9d9e141fba125b4178339510a3bbdbc869632ae68cb7c7d9bc16c9.

A sanitized exact excerpt from the purchased response was:

{"asset":"WETH","bestProtocol":"euler","gapBps":110,"rates":[{"protocol":"euler","apyBps":297,"weightedApyBps":258,"source":"defillama","asOf":"2026-07-27T23:45:38.192Z"},{"protocol":"aave","apyBps":148,"weightedApyBps":148,"source":"onchain","asOf":"2026-07-27T23:45:37.072Z"},{"protocol":"morpho","apyBps":145,"weightedApyBps":141,"source":"api","asOf":"2026-07-27T23:45:37.614Z"},{"protocol":"compound","apyBps":134,"weightedApyBps":133,"source":"onchain","asOf":"2026-07-27T23:45:37.096Z"},{"protocol":"moonwell","apyBps":104,"weightedApyBps":92,"source":"defillama","asOf":"2026-07-27T23:45:38.191Z"},{"protocol":"fluid","apyBps":82,"weightedApyBps":70,"source":"defillama","asOf":"2026-07-27T23:45:38.191Z"}],"asOf":"2026-07-27T23:45:38.192Z"}

This was useful as a one-call weth base yield result: the response was machine-readable and could be consumed without an account, API key, or manual checkout.